Edexcel A2 C3 Mathematics 12th June 2015

omds Sara, vectors is in C4, i was just kidding! damn.

its definitely decreasing :d:d

I am dying to see this trig identity ...

oh, i only attempted it once though, but got more solutions? i got 8

Can someone lease tell me how they solved

cos x + sin x 1
--------------- = ---
cos x - sin x 2

or am I just being a complete retard?

How many question were??

You have a situation like that. The green line is the modded function.

It intercepts two versions of the curve, one being the normal $f(x)$ and one being the $-f(x)$. So, you just take the function, solve for x normally. Then take the negative of the function and solve for x again.
So basically solving:
$[br]f(x) = 2 [br]-f(x) = 2[br]$
I don't remember what the answers were though. But that's what I did. Pretty confident that's the correct working.

its definitely decreasing

It isn't 1 less than -3 it's 2 less than -3 because you stretched the graph in the y axis by 2

i'm not complaining on the difficulty.. I know I made a ton of silly mistakes and if I had more time, I could have done better...

I'm just sick of seeing people being arrogant to others or making fun of others on this thread who did not do as well... if you did well, then congrats, but there is no need to rub it in people's faces... it may seem like a joke to you but some people are actually scared/concerned about their future.

looool sorry excuse me i just panicked

increasing! K was negative in bold!

Ohh, you mean solutions for the trigonometric equation. I don't think you'll be marked down for that, no. I've never seen a mark scheme state you can't have any other solutions, I've seen mark schemes say ignore any other solutions outside the range. So I don't think you'll be marked down, as long as you have the correct solutions of course.